Merge remote-tracking branch 'origin/develop' into refinement

.gitignore

.gitlab-ci.yml

CMakeLists.txt

Containers/dockerfiles/Ubuntu20_04.Dockerfile

Python/boundary_layer/__init__.py

Python/boundary_layer/boundary_layer.py

Python/boundary_layer/config.txt

apps/gpu/LBM/ActuatorLine/ActuatorLine.cpp

apps/gpu/LBM/BoundaryLayer/BoundaryLayer.cpp

apps/gpu/LBM/BoundaryLayer/CMakeLists.txt

apps/gpu/LBM/BoundaryLayer/configBoundaryLayer.txt

gpu.cmake

...idGenerator/grid/BoundaryConditions/BoundaryCondition.cpp

...GridGenerator/grid/BoundaryConditions/BoundaryCondition.h

src/gpu/GridGenerator/grid/BoundaryConditions/Side.cpp

src/gpu/GridGenerator/grid/BoundaryConditions/Side.h

src/gpu/GridGenerator/grid/Field.cpp

src/gpu/GridGenerator/grid/GridBuilder/GridBuilder.h

src/gpu/GridGenerator/grid/GridBuilder/LevelGridBuilder.cpp

src/gpu/GridGenerator/grid/GridBuilder/LevelGridBuilder.h